package com.whtq.api.oauth2;

import com.alibaba.fastjson.JSON;
import com.whtq.front.common.basics.WHTQReturnCode;
import com.whtq.front.common.model.response.WHTQRes;
import com.whtq.front.common.util.RequestContextUtil;
import org.apache.commons.lang.StringUtils;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.web.filter.authc.AuthenticatingFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * Created by
 *
 * @author wmi
 * @date 2021/9/15 - 15:57.
 * @description
 */
public class OAuth2Filter extends AuthenticatingFilter {

    protected final Logger logger = LoggerFactory.getLogger(this.getClass());

    @Override
    protected AuthenticationToken createToken(ServletRequest request, ServletResponse response) throws Exception {
        //获取请求token
        String token = getRequestToken((HttpServletRequest) request);

        if(StringUtils.isBlank(token)){
            return null;
        }

        return new OAuth2Token(token);
    }

    @Override
    protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
        if(((HttpServletRequest) request).getMethod().equals(RequestMethod.OPTIONS.name())){
            return true;
        }

        return false;
    }

    @Override
    protected boolean onAccessDenied(ServletRequest request, ServletResponse response) throws Exception {
        //获取请求token，如果token不存在，直接返回401
        String token = getRequestToken((HttpServletRequest) request);
        if(StringUtils.isBlank(token)){
            HttpServletResponse httpResponse = (HttpServletResponse) response;
            httpResponse.setContentType("application/json;charset=utf-8");
            httpResponse.setHeader("Access-Control-Allow-Credentials", "true");
            httpResponse.setHeader("Access-Control-Allow-Origin", RequestContextUtil.getOrigin());

            String json = JSON.toJSONString(WHTQRes.failure(WHTQReturnCode.INVALID_TOKEN));

            httpResponse.getWriter().print(json);

            return false;
        }

        return executeLogin(request, response);
    }

    @Override
    protected boolean onLoginFailure(AuthenticationToken token, AuthenticationException e, ServletRequest request, ServletResponse response) {
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        httpResponse.setContentType("application/json;charset=utf-8");
        httpResponse.setHeader("Access-Control-Allow-Credentials", "true");
        httpResponse.setHeader("Access-Control-Allow-Origin", RequestContextUtil.getOrigin());
        try {
            //处理登录失败的异常
            Throwable throwable = e.getCause() == null ? e : e.getCause();

            String json = JSON.toJSONString(WHTQRes.failure(WHTQReturnCode.INVALID_TOKEN));
            httpResponse.getWriter().print(json);
        } catch (IOException e1) {

        }

        return false;
    }

    /**
     * 获取请求的token
     */
    protected String getRequestToken(HttpServletRequest httpRequest){
        //从header中获取token
        String token = httpRequest.getHeader("accessToken");

        //如果header中不存在token，则从参数中获取token
        if(StringUtils.isBlank(token)){
            token = httpRequest.getParameter("accessToken");
        }

        return token;
    }
}
